/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.webapi.controller;

import static org.hisp.dhis.system.util.GeoUtils.replaceUnsafeSvgText;
import static org.hisp.dhis.system.util.SvgUtils.replaceUnicodeZeroWidthSpace;

import java.awt.Color;
import java.io.OutputStream;
import java.io.StringReader;
import javax.servlet.http.HttpServletResponse;
import org.apache.batik.transcoder.SVGAbstractTranscoder;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.ImageTranscoder;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.fop.svg.PDFTranscoder;
import org.hisp.dhis.common.DhisApiVersion;
import org.hisp.dhis.common.OpenApi;
import org.hisp.dhis.common.cache.CacheStrategy;
import org.hisp.dhis.system.util.CodecUtils;
import org.hisp.dhis.webapi.mvc.annotation.ApiVersion;
import org.hisp.dhis.webapi.utils.ContextUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@OpenApi.Document(domain = Server.class)
@Controller
@RequestMapping
@ApiVersion({DhisApiVersion.DEFAULT, DhisApiVersion.ALL})
public class SvgConversionController {
  @Autowired private ContextUtils contextUtils;

  @OpenApi.Response(byte[].class)
  @PostMapping(value = "/api/svg.png", consumes = ContextUtils.CONTENT_TYPE_FORM_ENCODED)
  public void toPng(
      @RequestParam String svg,
      @RequestParam(required = false) String filename,
      HttpServletResponse response)
      throws Exception {
    String name = filename != null ? (CodecUtils.filenameEncode(filename) + ".png") : "file.png";

    contextUtils.configureResponse(
        response, ContextUtils.CONTENT_TYPE_PNG, CacheStrategy.NO_CACHE, name, true);

    convertToPng(svg, response.getOutputStream());
  }

  @OpenApi.Response(byte[].class)
  @PostMapping(value = "/api/svg.pdf", consumes = ContextUtils.CONTENT_TYPE_FORM_ENCODED)
  public void toPdf(
      @RequestParam String svg,
      @RequestParam(required = false) String filename,
      HttpServletResponse response)
      throws Exception {
    String name = filename != null ? (CodecUtils.filenameEncode(filename) + ".pdf") : "file.pdf";

    contextUtils.configureResponse(
        response, ContextUtils.CONTENT_TYPE_PDF, CacheStrategy.NO_CACHE, name, true);

    convertToPdf(svg, response.getOutputStream());
  }

  // -------------------------------------------------------------------------
  // Supportive methods
  // -------------------------------------------------------------------------

  private void convertToPng(String svg, OutputStream out) throws TranscoderException {
    svg = replaceUnsafeSvgText(svg);

    PNGTranscoder transcoder = new PNGTranscoder();
    transcoder.addTranscodingHint(SVGAbstractTranscoder.KEY_ALLOW_EXTERNAL_RESOURCES, false);
    transcoder.addTranscodingHint(ImageTranscoder.KEY_BACKGROUND_COLOR, Color.WHITE);

    TranscoderInput input = new TranscoderInput(new StringReader(svg));

    TranscoderOutput output = new TranscoderOutput(out);

    transcoder.transcode(input, output);
  }

  private void convertToPdf(String svg, OutputStream out) throws TranscoderException {
    svg = replaceUnsafeSvgText(svg);
    svg = replaceUnicodeZeroWidthSpace(svg, " ");

    PDFTranscoder transcoder = new PDFTranscoder();

    transcoder.addTranscodingHint(SVGAbstractTranscoder.KEY_ALLOW_EXTERNAL_RESOURCES, false);

    TranscoderInput input = new TranscoderInput(new StringReader(svg));

    TranscoderOutput output = new TranscoderOutput(out);

    transcoder.transcode(input, output);
  }
}
